.page-about {
  --about-umber: #C44530;
  --about-ochre: #D99A2B;
  --about-line: #C9BFA8;
  background: var(--cream);
  color: var(--text-dark);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
}

/* ===== Breadcrumb ===== */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 20px 20px 0;
  font-size: 14px;
}
.page-about .breadcrumb__link {
  color: var(--about-umber);
  text-decoration: none;
  font-weight: 700;
}
.page-about .breadcrumb__link:hover {
  text-decoration: underline;
}
.page-about .breadcrumb__sep {
  color: var(--about-line);
}
.page-about .breadcrumb__current {
  color: var(--text-dark);
  font-weight: 600;
}

/* ===== Hero ===== */
.page-about .about-hero {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 44px 20px 28px;
}
.page-about .about-hero__kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-umber);
  background: rgba(199, 69, 48, 0.12);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
  color: var(--text-dark);
}
.page-about .about-hero__lead {
  font-size: 16px;
  max-width: 640px;
  color: #444;
  margin: 0 0 22px;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .hero-pill {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 999px;
  color: var(--text-light);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.01em;
}
.page-about .hero-pill--orange {
  background: var(--card-orange);
}
.page-about .hero-pill--green {
  background: var(--card-green);
}
.page-about .hero-pill--yellow {
  background: var(--card-yellow);
  color: var(--text-dark);
}
.page-about .hero-pill--blue {
  background: var(--tag-blue);
}

/* ===== Section Head ===== */
.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  margin-bottom: 26px;
}
.page-about .section-head__index {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--about-umber);
  background: rgba(199, 69, 48, 0.12);
  border-radius: 8px;
  padding: 4px 10px;
}
.page-about .section-head h2 {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.2;
  margin: 0;
}
.page-about .section-head__desc {
  width: 100%;
  font-size: 14px;
  color: #666;
  margin: 0;
}
.page-about .section-head--dark .section-head__index {
  background: rgba(245, 194, 66, 0.18);
  color: var(--card-yellow);
}
.page-about .section-head--dark h2 {
  color: var(--text-light);
}
.page-about .section-head--dark .section-head__desc {
  color: rgba(255, 255, 255, 0.72);
}

/* ===== About Section Layout ===== */
.page-about .about-section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 44px 20px;
}
.page-about .about-section--taxonomy {
  max-width: none;
  background: var(--deep-gray-blue);
  padding: 44px 20px;
}
.page-about .about-section--taxonomy .section-head,
.page-about .about-section--taxonomy .taxonomy-layout {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
}
.page-about .about-section--updates {
  max-width: none;
  background: var(--dark-purple);
  padding: 44px 20px;
}
.page-about .about-section--updates .section-head,
.page-about .about-section--updates .update-layout,
.page-about .about-section--updates .timeline-list {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
}
.page-about .about-section--feedback {
  border-top: 2px solid var(--border-light);
}

/* ===== Scope ===== */
.page-about .scope-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .scope-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.page-about .scope-card {
  border-radius: var(--radius-lg);
  padding: 22px 16px;
  color: var(--text-light);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 110px;
}
.page-about .scope-card--orange {
  background: var(--card-orange);
}
.page-about .scope-card--green {
  background: var(--card-green);
}
.page-about .scope-card--yellow {
  background: var(--card-yellow);
  color: var(--text-dark);
}
.page-about .scope-card--blue {
  background: var(--tag-blue);
}
.page-about .scope-card__value {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.page-about .scope-card__label {
  font-size: 13px;
  font-weight: 700;
  opacity: 0.85;
  letter-spacing: 0.05em;
}
.page-about .scope-figure {
  margin: 0;
}
.page-about .scope-figure__img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  background: #EDE4D0;
  display: block;
  box-shadow: var(--shadow-card);
}
.page-about .scope-figure__caption {
  font-size: 13px;
  color: #777;
  margin-top: 8px;
  text-align: center;
  font-family: var(--font-mono);
}
.page-about .scope-note {
  margin: 28px 0 0;
  font-size: 15px;
  color: #444;
  background: rgba(43, 58, 74, 0.05);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  border-left: 4px solid var(--about-umber);
}

/* ===== Taxonomy ===== */
.page-about .taxonomy-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .taxonomy-tree {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}
.page-about .tree-dim__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 16px;
  color: var(--text-light);
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.18);
  letter-spacing: 0.04em;
}
.page-about .tree-dim__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.page-about .tree-node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: default;
  transition: background 0.2s ease, transform 0.2s ease;
}
.page-about .tree-node:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateY(-1px);
}
.page-about .tree-node__name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-light);
}
.page-about .tree-node__count {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--card-yellow);
  background: rgba(245, 194, 66, 0.16);
  border-radius: 999px;
  padding: 2px 8px;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.page-about .tree-node:hover .tree-node__count {
  background: var(--card-yellow);
  color: var(--text-dark);
  transform: scale(1.1);
}
.page-about .tree-node--green .tree-node__count {
  color: #7AE0BD;
  background: rgba(57, 181, 138, 0.2);
}
.page-about .tree-node--green:hover .tree-node__count {
  background: var(--card-green);
  color: #fff;
}
.page-about .tree-node--yellow .tree-node__count {
  color: var(--card-yellow);
  background: rgba(245, 194, 66, 0.18);
}
.page-about .tree-node--yellow:hover .tree-node__count {
  background: var(--card-yellow);
  color: var(--text-dark);
}
.page-about .tree-dim__list--year {
  grid-template-columns: repeat(2, 1fr);
}
.page-about .taxonomy-figure {
  margin: 0;
}
.page-about .taxonomy-figure__img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  display: block;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-raised);
}
.page-about .taxonomy-figure__caption {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  text-align: center;
  margin-top: 10px;
  font-family: var(--font-mono);
}

/* ===== Updates ===== */
.page-about .update-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .update-figure {
  margin: 0;
}
.page-about .update-figure__img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  object-position: center top;
  border-radius: var(--radius-lg);
  background: #E7DBC0;
  display: block;
}
.page-about .update-content {
  display: flex;
  flex-direction: column;
  gap: 26px;
}
.page-about .update-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.page-about .update-card {
  border-radius: var(--radius-md);
  padding: 18px 16px;
  color: var(--text-light);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .update-card--orange {
  background: var(--card-orange);
}
.page-about .update-card--green {
  background: var(--card-green);
}
.page-about .update-card--yellow {
  background: var(--card-yellow);
  color: var(--text-dark);
}
.page-about .update-card__label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.8;
}
.page-about .update-card__value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
}
.page-about .timeline-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.page-about .timeline-group {
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: default;
  transition: background 0.2s ease;
}
.page-about .timeline-group:hover {
  background: rgba(255, 255, 255, 0.12);
}
.page-about .timeline-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.page-about .timeline-badge--version .timeline-badge__label {
  background: var(--card-yellow);
  color: var(--text-dark);
  font-weight: 900;
}
.page-about .timeline-badge__count {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--about-ochre);
  text-transform: uppercase;
}
.page-about .timeline-badge__label {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.14);
  padding: 2px 12px;
  border-radius: 999px;
}
.page-about .timeline-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-about .timeline-item {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid var(--about-ochre);
}
.page-about .timeline-item__meta {
  font-size: 12px;
  font-weight: 700;
  color: var(--about-ochre);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.page-about .timeline-item__title {
  line-height: 1.45;
}

/* ===== Browse Step ===== */
.page-about .browse-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .browse-step {
  border-radius: var(--radius-lg);
  background: #FFF;
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
  position: relative;
  border-top: 4px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .browse-step:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-raised);
}
.page-about .browse-step--orange {
  border-top-color: var(--card-orange);
}
.page-about .browse-step--green {
  border-top-color: var(--card-green);
}
.page-about .browse-step--yellow {
  border-top-color: var(--card-yellow);
}
.page-about .browse-step--blue {
  border-top-color: var(--tag-blue);
}
.page-about .browse-step__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-light);
  background: var(--text-dark);
  border-radius: 8px;
  padding: 2px 8px;
  display: inline-block;
  margin-bottom: 10px;
}
.page-about .browse-step--orange .browse-step__num {
  background: var(--card-orange);
}
.page-about .browse-step--green .browse-step__num {
  background: var(--card-green);
}
.page-about .browse-step--yellow .browse-step__num {
  background: var(--card-yellow);
  color: var(--text-dark);
}
.page-about .browse-step--blue .browse-step__num {
  background: var(--tag-blue);
}
.page-about .browse-step__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 18px;
  margin: 0 0 8px;
}
.page-about .browse-step__desc {
  font-size: 14px;
  color: #555;
  margin: 0;
  line-height: 1.6;
}

/* ===== Feedback ===== */
.page-about .feedback-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
.page-about .contact-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.page-about .contact-card {
  background: #FFF;
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 4px solid var(--card-yellow);
}
.page-about .contact-card__label {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #999;
}
.page-about .contact-card__value {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-dark);
  word-break: break-all;
}
.page-about .contact-card__value--mono {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.page-about .related-links {
  background: rgba(199, 69, 48, 0.07);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.page-about .related-links__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 16px;
  margin: 0 0 12px;
}
.page-about .related-links__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .related-links__list a {
  display: inline-block;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-light);
  background: var(--about-umber);
  border-radius: 999px;
  padding: 8px 16px;
  transition: background 0.2s ease, transform 0.2s ease;
}
.page-about .related-links__list a:hover {
  background: var(--accent-orange);
  transform: translateY(-2px);
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 40px 40px;
  }
  .page-about .about-hero h1 {
    font-size: 48px;
  }
  .page-about .about-hero__lead {
    font-size: 18px;
  }
  .page-about .about-section {
    padding: 60px 40px;
  }
  .page-about .about-section--taxonomy,
  .page-about .about-section--updates {
    padding: 60px 40px;
  }
  .page-about .section-head {
    flex-wrap: nowrap;
    align-items: center;
    gap: 14px;
  }
  .page-about .section-head__desc {
    width: auto;
    margin-left: auto;
    text-align: right;
  }
  .page-about .scope-layout {
    grid-template-columns: 1fr 1.1fr;
    align-items: center;
    gap: 36px;
  }
  .page-about .scope-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .page-about .scope-card {
    min-height: 130px;
    padding: 26px 20px;
  }
  .page-about .scope-card__value {
    font-size: 36px;
  }
  .page-about .taxonomy-layout {
    grid-template-columns: 3fr 2fr;
    gap: 40px;
    align-items: start;
  }
  .page-about .taxonomy-tree {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .page-about .tree-dim:first-child {
    grid-column: 1 / -1;
  }
  .page-about .tree-dim:first-child .tree-dim__list {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .tree-dim__list {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .update-layout {
    grid-template-columns: 200px 1fr;
    gap: 32px;
    align-items: start;
  }
  .page-about .update-figure__img {
    width: 200px;
    height: 600px;
    object-fit: cover;
    object-position: top;
  }
  .page-about .update-cards {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .timeline-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .page-about .browse-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .page-about .feedback-layout {
    grid-template-columns: 2fr 1fr;
    gap: 32px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .browse-steps {
    grid-template-columns: repeat(4, 1fr);
  }
}